Start with the 06:55 İDO ferry from Istanbul to Bursa, about 2h 15m. Transfer in Bursa, then take the 11:15 FlixBus bus on to İstanbul Esenler (2h 54m). Transfer in İstanbul Esenler, then take the 15:30 (+1d) FlixBus bus on to Sofia (8h 30m). Transfer in Sofia, then take the 07:00 (+1d) FlixBus bus on to Athens (12h 21m). You arrive in Athens around 19:21 (+1d). In total it's roughly EUR 158 over 37h 21m, 3 transfers.
İDO
FlixBusOpens Omio — enter your date to compare trains and buses for this route; the price is finalised at checkout.
FlixBusOpens Omio — enter your date to compare trains and buses for this route; the price is finalised at checkout.
FlixBusOpens Omio — enter your date to compare trains and buses for this route; the price is finalised at checkout.
Ground-only route to Athens by ferry + bus. Ferry (İDO, 2h 15min) + Bus (FlixBus, 2h 54min) via Bursa + Bus (FlixBus, 8h 30min) via İstanbul Esenler + Bus (FlixBus, 12h 21min) via Sofia.